Device for pointing bristles of brushes



Feb. 1, 1930. R IZAWA DEVICE FOR `POINlINGr BRISTLES OF BRUSHES EiledMarch '7. 1928 NVENTOR; v?il'o/1iru BY:

/zawa Pr T T 0 NY Patented Feb. 11, 1930 PATENT orifice RIICHIRO IZAWA,OF KYOTO, JAPAN DEVICE FOR POINTING BIRIIS'JJLCES` OF BRUSHESApplication filed March 7, 1923, Serial No. 259,634, and in JapanElla-rch 19, 1927.

circumference and an abrading wheel having numerous needles project fromthe circumference. In this device, bristle holding members are fixed tothe said carrying wheel in such a manneras each to rotate on its own j1f axis. The said holding members are provided with several projectionsaround them, and the frame has also projections at such position thatthey touch the projections ofthe bristle holding members. `t is also sodevised that during the rotation of the bristle carrying wheel, each ofthe bristle holding members is slightly revolved whenever it passes thesaid projections of the frame, so that each time the bristles may exposefresh surfaces to the abrading wheel. The object of this invention is toabrade uniformly the thick bristles like those of paint brushes and`obtain uniformly-pointed bristles.`

Referring to the accompanyingl drawing,

Fig. 1 is a front elevation of the device of this invention;

Fig. 2 is a front elevation, partly in section of the bristle holdingdevices which constitute a part of the device shown in Fig. l;

Fig. 3 is a sectional side elevation of the same devices;

Fig. el is a plan of the same and Fig. 5 is a detail view, on anenlarged scale, of a portion of the abrading wheel, illustrat ing` theabrasive elements.

In the drawing, (1) is a bristle carrying wheel; and (2), an abradingwheel. The abrading wheel (2) may be of the construction shown anddescribed in Letters Patent No. 1,627,704, issued to me under date ofMay 10, 1927, and which wheel carries a plurality of pins (3), to whichabrading material like emery powder is adhered, planted around its rimand is mounted on the frame (4). The bristle carrying wheel (1) hasaround its rim several bristle holding members as will be eX- plainedhereinafter. lt is slidably mounted on the frame (4) and can be broughtclose to or away from the abrading Wheel by means of a screwed shaft(5). As both the bristle carrying and abrading wheels are rotated by asuitable mechanism, the pins (3) penetrate into the bristles and abradethem when the two wheels approach each other.

rlhe bristle holding member (6) is pro- 55 vided with a hole (9), forinserting Qthe handle (8) of a brush (7) or a holder of the bristlestemporarily bundled and with set screws (10) for clamping the saidhandle or holder. The exterior` of said member (6) is 60 cylindrical andhas a continuous groove (11) 'and several projections (12) on thecircum- Y ference. The supporting block (13) has a vcylindrical socket(il) at its upper portion to receive the said bristle holding` member(6), 65

and an opening (16) at its lower portion for the handle to be looselyinserted. The set screws in the said supporting block (13) project theirheads into the groove (11) A number of recesses (17) are provided on the70 circumference of the carrying wheel and the said supporting blocks(13) are loosely in serted into the respective recesses, and are pivotedby the pins (18) at the middle portion of both sides respectively to thewalls of the 7 said recesses. (19) is a projection on the frame andsituated so as to touch the proj ections (12) during the rotation of thecarrying wheel (1).

The device of the present invention abrades and points the bristlesplanted on a brush handle as shown in (7) or temporarily bundledbristles for brushes in order to obtain soft and line bristles. The saidbundles of bristles (7) are attached to the holding mem- 85 ber (6) andpointed by the needles (3) when both the carrying wheel (l) and theabrading wheel (2) are rotated. When each of the bundles of bristles (7)passes by the projection (19) on the frame during the rotation of thecarrying wheel (1), the projections (12) of the bristle holding membertouch the proj ection (19) in consequence of which the holding member(6) is slightly turned in the gr socket (lll). As each of the holdingmemo bers is somewhat turned every time it passes by the projection (19)during the rotation of the carrying wheel, the bundles of bristles turnfresh surfaces to the abrading wheel every time they come to the workingposition ,1

of the abrading Wheel, and therefore are point-ed in the dierent sides.As the bristles bend down under the pressure of the pins when worked bythe abrading wheel, they are abraded slantwise even if attached in trueradial relat-ion to the carrying wheel, I-Iowever, the supporting block(13) and the holding member (6) together with bristles attached theretoare capable oit rocking freely about the pivots (18) in the exampleshown in the accompanying drawing so that the bristles are inclinedtowards the direction of' their rotation by the action of the needles(3) of the abrading wheel and are abraded slantwise. If the directionsof rotations of the abrading wheel and the carrying wheel are reversed,every bristle is inclined automatically in the opposite direction andwill receive the pointing action of the abrading needles. In brusheswith slender bristles such as paste-brushes, tooth brushes, etc., thebristles can be uniformly abraded and pointed by the abrading actiongiven slantwise to their ends from one or both sides. However, if thebristles form thick layers such as those of paint brushes, it is verydiiiicult to obtain uniformly-pointed bristles by the abrading actiongiven from one or both sides. For instance, if abraded from two oppositedirections, they will become irregular in length. Especially, whenpressed by the abrading wheel, the bristles offer more resistance tobending at the central dense portion and consequently receive theact-ion of the abrading Wheel more than those at the outer thin layers.Thus, the end of a brush is apt to become concave. However, according tothis invention, the bundle of bristles is slightly revolved every timeit receives the action of the abrading pins and therefore is abradedfrom different directions, so that uniformly abraded and pointedbristles can be obtained.

Although Fig, l shows an example which comprises a pair of carryingwheel and an abrading wheel, the arrangement may be changed at will.

Claims V 1. A device for pointing bristles of brushes, consisting of anabrading wheel, a bristle carrying wheel, supporting blocks disposedradially and pivoted to the said carrying wheel so as to make rockingmovements to and fro, cylindrical sockets provided in the saidsupporting blocks, brush holding` members rotatably inserted in the saidsockets, radial projections provided on the circumferences of the saidholding members, and a projection fixed to the frame in such a positionthat it touches the said radial projections ol the holding membersduring the rotation of the carrying wheel.

2. In a device for pointing bristles, the combination of abristle-carrying wheel, a plurality of bristle-holding members mountedin the periphery of said carrying wheel and each rotatable around itsown aXis and capable of rocking movement in the direction of rotation ofthe carrying wheel, radial projections carried by said bristle-holdingmembers, and a fixed projection disposed in position to engage saidradial projections during rotation of said carrying wheel thereby torotate said bristle-holding members.

3. In a device for pointing bristles, the combination of a wheel havinga plurality of radial openings extending inwardly from its periphery, asupporting block, pivoted in each of said openings for rocking movementin the direction of the circumference of the wheel, a brush-holdermember mounted for rotation in each of said blocks, and means forautomatically rotating said brush-holding members in a step-by-stepmovement dur ing rotation of said wheel.

RIICHIRO IZAIVA.

